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It depends on what factor is optimized. You can only optimize one at the expense or the other two and they are bandwidth, forward gain, or front/back ratio. Some maunfacturers like to try and make short booms attractive to people with limited space so they develop a short boom which would require slightly different element lengths. In all honesty I cannot even imaging an 11m quad with a 3 foot boom. That is only about half of optimal spacing.